Answer:
Nalani is correct.
Step-by-step explanation:
Given - Nalani says the expression 9+7r cannot be factored using the GCF.
To find - Is she correct? Explain why or why not.
Proof -
GCF - Greater Common factor
Given that, the expression is - 9 + 7r
As
HCF(9, 7) = 1
So , we can not factor the expression.
i.e. there does not exist any number who is a multiple of 9 and 7 both.
So,
Nalani is correct.
Example -
Let the expression be 24 + 18x
HCF(24, 18) = 6
So,
24 + 18x = 6(4 + 3x)
One of the ways to solve a system of equation is by using the substitution method
The values of x and y are -9 and 5
<h3>How to use the
substitution method </h3>
The equations are given as:
2x + 6y = 12
x + y = -4
Make x the subject in the second equation
x = -4 - y
Substitute x = -4 - y in the first equation
2(-4 - y) + 6y = 12
Expand
-8 - 2y + 6y = 12
Add 8 to both sides
- 2y + 6y = 20
So, we have:
4y =20
Divide through by 4
y = 5
Recall that:
x = -4 - y
So, we have:
x = -4 - 5
x = -9
Hence, the values of x and y are -9 and 5
Read more about the substitution method at:
brainly.com/question/13476446
well, from 340 down to 150, their difference is 190.
now, if we take 340 to be the 100%, what is 190 off of it in percentage?
Answer:
36 +23i
Step-by-step explanation:
(3+8i) (4-3i)
FOIL
first: 3*4 = 12
outer: 3*-3i = -9i
inner: 8i *4 = 32i
last: 8i * -3i = -24i^2 = -24 (-1) = 24
Add these together
12+-9i+32i +24
Combine like terms
36 +23i
Answer:
Step-by-step explanation:
